condition mean min max ZT0-3 641.0 641.0 641.0 ZT4-7 325.8 325.8 325.8 ZT8-11 352.9 352.9 352.9 ZT12-15 435.8 435.8 435.8 ZT16-19 500.2 500.2 500.2 ZT20-23 686.1 686.1 686.1